US3405444A

US3405444A - Internal ridging tool

Info

Publication number: US3405444A
Application number: US613198A
Authority: US
Inventors: Jerry F Richmond; Jerry S Boone; Lawrence W Langley
Original assignee: Corning Glass Works
Current assignee: Corning Glass Works
Priority date: 1967-02-01
Filing date: 1967-02-01
Publication date: 1968-10-15
Anticipated expiration: 1985-10-15

Description

1963 J. F. RICHMOND ET AL 3,405,444

INTERNAL RIDGING TOOL Filed Feb. 1, 1967 JERRY F RICHMOND JERRY S. BOONE LAWRENCE W. LANGLEY ATTORNEYS INVENTORSL v v United States Patent Office 3,405,444 Patented Oct. 15, 1968 3,405,444 INTERNAL RIDGING TOOL Jerry F. Richmond, Knightdale, Jerry S. Boone, Garner,

and Lawrence W. Langley, Raleigh, N.C., assignors to Corning Glass Works, Corning, N.Y., a corporation of New York Filed Feb. 1, 1967, Ser. No. 613,198 4 Claims. (Cl. 30-106) ABSTRACT OF THE DISCLOSURE A tool for cutting ridges or grooves in the internal surface of a cylindrical bore hole.

Background of the invention In the field of fluid amplifiers, it is necessary to make a plurality of fluid connections to a block of material, such as plastic or the like, which contains the various flow passages for the fluid amplifier. Often times due to the fluid circuit design, it will be necessary to place a plurality of adapters very close to each other. Prior art devices utilized a nipple arrangement which was secured in the bore hole in the block of plastic material and the conduit or hose was clamped thereto by means of some external apparatus. Due to the size of these external clamping arrangements, the closeness of the fluid connectors was limited.

In accordance with the present invention, the various connector holes are drilled at the desired locations in the fluid amplifier block and the flexible tubing is inserted into the bore hole. The internal surface of the bore hole is provided with a series of ridges and grooves, the ridges being directed inwardly at an angle to assist in holding the flexible conduit within the bore hole. When fluid pressure is applied to the conduit, the conduit has a tendency to expand into even tighter engagement with the internal ridges of the bore hole to provide a positive lock preventing the withdrawal of the conduit. Since there are no external connectors, the various fluid connectors may be placed very close together.

Summary of the invention An internal ridging tool comprising hollow cylindrical casing means, cylindrical blade holding means slidably mounted in said casing and protruding from one end thereof, blade means secured to said blade holding means for movement transverse to the longitudinal axis of said blade holder means, said blade means being provided with a plurality of cutting teeth adjacent one end thereof and wedge means secured to said casing and disposed in contact with said blade means adjacent said cutting teeth to cam said cutting teeth away from the longitudinal axis of said blade holding means upon longitudinal movement of said blade holding means with respect to said casing.

Other features of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principles of the invention and the best mode which has been contemplated of applying those principles.

In the drawings:

FIGURE 1 shows a perspective view of the internal ridging tool of the invention;

FIGURE 2 is a transverse sectional View of the tool shown in FIGURE 1 with the cutting teeth in the retracted position;

FIGURE 3 is a transverse sectional view similar to FIGURE 2 showing the cutting teeth in their expanded positions; and

FIGURE 4 is a cross-sectional view along the line 4-4 of FIGURE 2.

In the drawings, the internal ridging tool is generally designated by the reference numeral 10. The tool is comprised of a cylindrical casing member 12 having a large diameter bore 14 extending axially thereof from one end of the casing. A small diameter bore extends axially of the casing 12 from the other end of the casing and intersects with the large diameter cylindrical bore 14. A cylindrical blade holding member 18 is slidably mounted within the large diameter bore 14 and protrudes from the bore a considerable distance. The blade holding member 18 is provided with a transverse slot 20, which is cut through the cylindrical blade holder member 18 on a diameter thereof. A cylindrical bore 22 is also formed in the cylindrical blade holding member 18 along an axis thereof. A pair of pins 24 are secured in radial openings in the casing 12 and extend into the slot 20 to prevent the with drawal of the blade holding member 18 from the bore 14 in the casing 12. A spring 26 is provided in the bore 14 between the bottom of the bore and the end of the member 18 to normally bias the member 18 outwardly of the bore 14 into engagement with the stop pins 24.

A bearing retainer 28 is clamped to the blade holding member 18 intermediate the ends thereof. The bearing retainer 28 is formed as a split ring and the ends of the ring are secured by means of screws 30. A spacer member 32 is inserted between the ends of the split ring 28 and has a thickness equal to the thickness of the slot 20 so as to prevent the ring 28 from squeezing the slot 20 closed when the retainer 28 is clamped on blade holding member 18. The screws 30 extend through the spacer member 32. A second bearing retaining sleeve 34 is press fitted on the bearing retainer 28 and is provided with an internal groove 36 adapted to loosely enclose a thrust type bearing. The bearing is comprised of a pair of races 27 and 29 and an intermediate ball retaining member 31. Such a thrust hearing is considered conventional in the art. However, the outermost race 29 is beveled at a 45 angle to provide a suitable gripping surface for the retainer. The end surface 33 of the bearing race 29 extends beyond the end of the retaining sleeve 34.

A pair of '

blade members

38 and 40 are located substantially within the slot 20 and are pinned to the blade holding member 18 by means of pins 42. The portion of the

blades

38 and 40 which extend outwardly beyond the bearing retainer 28 are provided with a plurality of cutting teeth 44 along their outermost edge. The innermost edge of each blade in the area of the teeth is formed with tapered camming notches 46.

An elongated taper shaft 48 is secured in the bore 16 of the casing 12 by means of a set screw 50. The taper shaft extends axially of the casing 12 and protrudes from the end thereof a substantial distance. The outer end of the taper shaft 48 is provided with a pair of

conical wedging surfaces

52 and 54 which are adapted to cooperate with the camming surfaces 46 on the blade members. In the normal position of the blades, the blades are held snugly to the shaft 48 along their entire length with the notches 46 inteifitting with the

wedging surfaces

52 and 54, as shown in FIGURE 2.

In the operation of the device, the spring 26 normally biases the blade holder 18 to its outermost position. Since the taper shaft 48 and its

wedging surfaces

52 and 54 are axially secured with respect to the casing 12, the end of the

blades

38 and 40 having the teeth 44 thereon will be biased inwardly by the inherent resiliency of the blades to the position shown in FIGURE 2. The casing member 12 is secured in any rotating member, such as a drill press, spindle, etc. As the entire tool is rotated and moved forward into a predrilled hole in the workpiece, the end surface 33 of the outermost ball race 29 of the thrust bearing will come into contact with the outer surface of the workpiece. At this stage the tool will still be in 3 the position shown in FIGURE 2 and the portions of the

blade members

38 and 40 having the cutting teeth 44 thereon will be located fully within the hole but in their retracted position.

The thrust bearing now contacting the workpiece and floating freely within the retaining groove 36 of sleeve 34 causes forward advancement to cease altogether for the bearing members (27, 29 and 31), the bearing retainers (28, 34), blade members (38, 40), blade holder 18 and spacer 32, while they continue to rotate, being driven by pins 24 which fit snugly but freely in the same slots in the blade holder 18 as the

blade members

38 and 40. Forward motion continues to advance casing 12 and shaft 48 against the pressure of the spring 26 and the

wedging surfaces

52 and 54 thereby cam the teeth carrying portions of the

blade members

38 and 40 outwardly of the slot into engagement with the internal wall of the predrilled hole. Continued rotation of the tool and advancement of casing 12 and shaft 48 will cut the grooves into the internal wall of the hole to a predetermined depth. When the casing 12 abuts the bearing retainer 28 as shown in FIGURE 3, the blades will be cammed outwardly to the maximum extent.

Tool retraction first initiates blade contraction away from the grooves and ridges cut in the hole by the action of spring 26 until pins 24 reach the end of the slot 20 in holder 18, thereby limiting the outward travel of the holder 18 from casing 12. After this the continued withdrawal of the tool lifts the entire tool from the workpiece and out of the hole with a plurality of ridges and grooves now cut inside. Note that all parts of the tool are rotating with the rotatable drive member throughout the entire operation except the outermost ball bearing race 29 which floats freely with the retainer sleeve 34 when in contact with the work surface.

Obviously, many modifications and variations of the present invention are possible in the light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. A rotatable internal ridging tool comprising hollow cylindrical casing means adapted to be secured to a rotatable chuck, cylindrical blade holding means slidably and non-rotatably mounted for reciprocating movement in said casing and protruding from one end thereof, blade means secured to said blade holding means for movement transverse to the longitudinal axis of said blade holding means, said blade means being provided with a plurality of cutting teeth adjacent one end thereof for cutting a plurality of circumferential grooves upon rotation of said tool and wedge means fixedly secured directly to said casing and disposed in contact with said blade means adjacent said cutting teeth to cam said cutting teeth away from the longitudinal axis of said blade holding means upon longitudinal movement of said casing means with respect to said blade holding means.

2. An internal ridging tool as set forth in claim 1 further comprising spring means adapted to bias said blade holding means outwardly of said hollow cylindrical casing means and stop means to limit the movement of said holding means relative to said casing means.

3. An internal ridging tool as set forth in claim 1 wherein said wedge means is comprised of an elongated shaft having tapered wedging surfaces on one end thereof secured concentrically with said casing and extending concentrically within said holding means with said wedging surfaces in contact with said blade means adjacent the toothed ends thereof.

4. An internal ridging tool as set forth in claim 1 further comprising bearing means rotatably secured on said holding means externally of said casing to limit the insertion of said blade holding means into a hole in a workpiece.

References Cited UNITED STATES PATENTS 408,162 7/1889 Condon 30-92.5 1,448,730 3/1923 Davis 30337 JAMES L. JONES, JR., Primary Examiner.